1 /* Operating system specific defines to be used when targeting GCC for
2 hosting on Windows32, using a Unix style C library and tools.
3 Copyright (C) 1995-2023 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #define DWARF2_DEBUGGING_INFO 1
22
23 #undef PREFERRED_DEBUGGING_TYPE
24 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
25
26 #undef TARGET_SEH
27 #define TARGET_SEH (TARGET_64BIT_MS_ABI && flag_unwind_tables)
28
29 /* Win64 with SEH cannot represent DRAP stack frames. Disable its use.
30 Force the use of different mechanisms to allocate aligned local data. */
31 #undef MAX_STACK_ALIGNMENT
32 #define MAX_STACK_ALIGNMENT (TARGET_SEH ? 128 : MAX_OFILE_ALIGNMENT)
33
34 /* 32-bit Windows aligns the stack on a 4-byte boundary but SSE instructions
35 may require 16-byte alignment. */
36 #undef STACK_REALIGN_DEFAULT
37 #define STACK_REALIGN_DEFAULT TARGET_SSE
38
39 /* Support hooks for SEH. */
40 #undef TARGET_ASM_UNWIND_EMIT
41 #define TARGET_ASM_UNWIND_EMIT i386_pe_seh_unwind_emit
42 #undef TARGET_ASM_UNWIND_EMIT_BEFORE_INSN
43 #define TARGET_ASM_UNWIND_EMIT_BEFORE_INSN false
44 #undef TARGET_ASM_FUNCTION_END_PROLOGUE
45 #define TARGET_ASM_FUNCTION_END_PROLOGUE i386_pe_seh_end_prologue
46 #undef TARGET_ASM_EMIT_EXCEPT_PERSONALITY
47 #define TARGET_ASM_EMIT_EXCEPT_PERSONALITY i386_pe_seh_emit_except_personality
48 #undef TARGET_ASM_INIT_SECTIONS
49 #define TARGET_ASM_INIT_SECTIONS i386_pe_seh_init_sections
50 #define SUBTARGET_ASM_UNWIND_INIT i386_pe_seh_init
51
52 #undef DEFAULT_ABI
53 #define DEFAULT_ABI (TARGET_64BIT ? MS_ABI : SYSV_ABI)
54
55 #undef TARGET_PECOFF
56 #define TARGET_PECOFF 1
57
58 #if ! defined (USE_MINGW64_LEADING_UNDERSCORES)
59 #undef USER_LABEL_PREFIX
60 #define USER_LABEL_PREFIX (TARGET_64BIT ? "" : "_")
61
62 #undef LOCAL_LABEL_PREFIX
63 #define LOCAL_LABEL_PREFIX (TARGET_64BIT ? "." : "")
64
65 #undef ASM_GENERATE_INTERNAL_LABEL
66 #define ASM_GENERATE_INTERNAL_LABEL(BUF,PREFIX,NUMBER) \
67 sprintf ((BUF), "*%s%s%ld", LOCAL_LABEL_PREFIX, \
68 (PREFIX), (long)(NUMBER))
69
70 #undef LPREFIX
71 #define LPREFIX (TARGET_64BIT ? ".L" : "L")
72
73 #endif
74
75 #undef DEBUGGER_REGNO
76 #define DEBUGGER_REGNO(n) \
77 (TARGET_64BIT ? debugger64_register_map[n] \
78 : (dwarf_debuginfo_p () \
79 ? svr4_debugger_register_map[n] : debugger_register_map[n]))
80
81 /* Map gcc register number to DWARF 2 CFA column number. For 32 bit
82 target, always use the svr4_debugger_register_map for DWARF .eh_frame
83 even if we don't use DWARF .debug_frame. */
84 #undef DWARF_FRAME_REGNUM
85 #define DWARF_FRAME_REGNUM(n) \
86 (TARGET_64BIT ? debugger64_register_map[(n)] \
87 : svr4_debugger_register_map[(n)])
88
89 /* The 64-bit MS_ABI changes the set of call-used registers. */
90 #undef DWARF_FRAME_REGISTERS
91 #define DWARF_FRAME_REGISTERS (TARGET_64BIT ? 33 : 17)
92
93 /* Use section relative relocations for debugging offsets. Unlike
94 other targets that fake this by putting the section VMA at 0, PE
95 won't allow it. */
96 #define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL, OFFSET, SECTION) \
97 do { \
98 switch (SIZE) \
99 { \
100 case 4: \
101 fputs ("\t.secrel32\t", FILE); \
102 assemble_name (FILE, LABEL); \
103 if ((OFFSET) != 0) \
104 fprintf (FILE, "+" HOST_WIDE_INT_PRINT_DEC, \
105 (HOST_WIDE_INT) (OFFSET)); \
106 break; \
107 case 8: \
108 /* This is a hack. There is no 64-bit section relative \
109 relocation. However, the COFF format also does not \
110 support 64-bit file offsets; 64-bit applications are \
111 limited to 32-bits of code+data in any one module. \
112 Fake the 64-bit offset by zero-extending it. */ \
113 fputs ("\t.secrel32\t", FILE); \
114 assemble_name (FILE, LABEL); \
115 if ((OFFSET) != 0) \
116 fprintf (FILE, "+" HOST_WIDE_INT_PRINT_DEC, \
117 (HOST_WIDE_INT) (OFFSET)); \
118 fputs ("\n\t.long\t0", FILE); \
119 break; \
120 default: \
121 gcc_unreachable (); \
122 } \
123 } while (0)
124
125 #define TARGET_EXECUTABLE_SUFFIX ".exe"
126
127 #define TARGET_OS_CPP_BUILTINS() \
128 do \
129 { \
130 if (!TARGET_64BIT) \
131 builtin_define ("_X86_=1"); \
132 if (TARGET_SEH) \
133 builtin_define ("__SEH__"); \
134 builtin_assert ("system=winnt"); \
135 builtin_define ("__stdcall=__attribute__((__stdcall__))"); \
136 builtin_define ("__fastcall=__attribute__((__fastcall__))"); \
137 builtin_define ("__thiscall=__attribute__((__thiscall__))"); \
138 builtin_define ("__cdecl=__attribute__((__cdecl__))"); \
139 if (!flag_iso) \
140 { \
141 builtin_define ("_stdcall=__attribute__((__stdcall__))"); \
142 builtin_define ("_fastcall=__attribute__((__fastcall__))"); \
143 builtin_define ("_thiscall=__attribute__((__thiscall__))"); \
144 builtin_define ("_cdecl=__attribute__((__cdecl__))"); \
145 } \
146 /* Even though linkonce works with static libs, this is needed \
147 to compare typeinfo symbols across dll boundaries. */ \
148 builtin_define ("__GXX_MERGED_TYPEINFO_NAMES=0"); \
149 builtin_define ("__GXX_TYPEINFO_EQUALITY_INLINE=0"); \
150 EXTRA_OS_CPP_BUILTINS (); \
151 } \
152 while (0)
153
154 /* Get tree.cc to declare a target-specific specialization of
155 merge_decl_attributes. */
156 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 1
157
158 /* This macro defines names of additional specifications to put in the specs
159 that can be used in various specifications like CC1_SPEC. Its definition
160 is an initializer with a subgrouping for each command option.
161
162 Each subgrouping contains a string constant, that defines the
163 specification name, and a string constant that used by the GCC driver
164 program.
165
166 Do not define this macro if it does not need to do anything. */
167
168 #undef SUBTARGET_EXTRA_SPECS
169 #define SUBTARGET_EXTRA_SPECS \
170 { "mingw_include_path", DEFAULT_TARGET_MACHINE }
171
172 #undef MATH_LIBRARY
173 #define MATH_LIBRARY ""
174
175 #undef TARGET_LIBC_HAS_FUNCTION
176 #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function
177
178 #define SIZE_TYPE (TARGET_64BIT ? "long long unsigned int" : "unsigned int")
179 #define PTRDIFF_TYPE (TARGET_64BIT ? "long long int" : "int")
180
181 #define WCHAR_TYPE_SIZE 16
182 #define WCHAR_TYPE "short unsigned int"
183
184 /* Windows64 continues to use a 32-bit long type. */
185 #undef LONG_TYPE_SIZE
186 #define LONG_TYPE_SIZE 32
187
188 #define drectve_section() \
189 (fprintf (asm_out_file, "\t.section .drectve\n"), \
190 in_section = NULL)
191
192 /* Older versions of gas don't handle 'r' as data.
193 Explicitly set data flag with 'd'. */
194 #define READONLY_DATA_SECTION_ASM_OP "\t.section .rdata,\"dr\""
195
196 /* Don't allow flag_pic to propagate since gas may produce invalid code
197 otherwise. */
198
199 #undef SUBTARGET_OVERRIDE_OPTIONS
200 #define SUBTARGET_OVERRIDE_OPTIONS \
201 do { \
202 flag_pic = TARGET_64BIT ? 1 : 0; \
203 } while (0)
204
205 /* Define this macro if references to a symbol must be treated
206 differently depending on something about the variable or
207 function named by the symbol (such as what section it is in).
208
209 On i386 running Windows NT, modify the assembler name with a suffix
210 consisting of an atsign (@) followed by string of digits that represents
211 the number of bytes of arguments passed to the function, if it has the
212 attribute STDCALL.
213
214 In addition, we must mark dll symbols specially. Definitions of
215 dllexport'd objects install some info in the .drectve section.
216 References to dllimport'd objects are fetched indirectly via
217 _imp__. If both are declared, dllexport overrides. This is also
218 needed to implement one-only vtables: they go into their own
219 section and we need to set DECL_SECTION_NAME so we do that here.
220 Note that we can be called twice on the same decl. */
221
222 #define SUBTARGET_ENCODE_SECTION_INFO i386_pe_encode_section_info
223
224 /* Local and global relocs can be placed always into readonly memory
225 for PE-COFF targets. */
226 #undef TARGET_ASM_RELOC_RW_MASK
227 #define TARGET_ASM_RELOC_RW_MASK i386_pe_reloc_rw_mask
228
229 /* Output a common block. */
230 #undef ASM_OUTPUT_ALIGNED_DECL_COMMON
231 #define ASM_OUTPUT_ALIGNED_DECL_COMMON \
232 i386_pe_asm_output_aligned_decl_common
233
234 /* Output the label for an initialized variable. */
235 #undef ASM_DECLARE_OBJECT_NAME
236 #define ASM_DECLARE_OBJECT_NAME(STREAM, NAME, DECL) \
237 do { \
238 i386_pe_maybe_record_exported_symbol (DECL, NAME, 1); \
239 ASM_OUTPUT_LABEL ((STREAM), (NAME)); \
240 } while (0)
241
242 /* Output a reference to a label. Fastcall function symbols
243 keep their '@' prefix, while other symbols are prefixed
244 with user_label_prefix. */
245 #undef ASM_OUTPUT_LABELREF
246 #define ASM_OUTPUT_LABELREF(STREAM, NAME) \
247 do { \
248 if ((NAME)[0] != FASTCALL_PREFIX) \
249 fputs (user_label_prefix, (STREAM)); \
250 fputs ((NAME), (STREAM)); \
251 } while (0)
252
253 /* This does much the same in memory rather than to a stream. */
254 #undef TARGET_MANGLE_ASSEMBLER_NAME
255 #define TARGET_MANGLE_ASSEMBLER_NAME i386_pe_mangle_assembler_name
256
257
258 /* Emit code to check the stack when allocating more than 4000
259 bytes in one go. */
260 #define CHECK_STACK_LIMIT 4000
261
262 /* By default, target has a 80387, uses IEEE compatible arithmetic,
263 returns float values in the 387 and needs stack probes.
264 We also align doubles to 64-bits for MSVC default compatibility. */
265
266 #undef TARGET_SUBTARGET_DEFAULT
267 #define TARGET_SUBTARGET_DEFAULT \
268 (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS \
269 | MASK_STACK_PROBE | MASK_ALIGN_DOUBLE)
270
271 #undef TARGET_SUBTARGET64_DEFAULT
272 #define TARGET_SUBTARGET64_DEFAULT \
273 MASK_128BIT_LONG_DOUBLE
274
275 /* This is how to output an assembler line
276 that says to advance the location counter
277 to a multiple of 2**LOG bytes. */
278
279 #undef ASM_OUTPUT_ALIGN
280 #define ASM_OUTPUT_ALIGN(FILE,LOG) \
281 if ((LOG) != 0) fprintf ((FILE), "\t.align %d\n", 1 << (LOG))
282
283 /* Windows uses explicit import from shared libraries. */
284 #define MULTIPLE_SYMBOL_SPACES 1
285
286 #define TARGET_ASM_UNIQUE_SECTION i386_pe_unique_section
287 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
288
289 #define SUPPORTS_ONE_ONLY 1
290
291 /* Switch into a generic section. */
292 #define TARGET_ASM_NAMED_SECTION i386_pe_asm_named_section
293
294 /* Select attributes for named sections. */
295 #define TARGET_SECTION_TYPE_FLAGS i386_pe_section_type_flags
296
297 /* Write the extra assembler code needed to declare a function
298 properly. */
299 #undef ASM_DECLARE_FUNCTION_NAME
300 #define ASM_DECLARE_FUNCTION_NAME(FILE, NAME, DECL) \
301 i386_pe_start_function (FILE, NAME, DECL)
302
303 /* Write the extra assembler code needed to declare the name of a
304 cold function partition properly. */
305
306 #undef ASM_DECLARE_COLD_FUNCTION_NAME
307 #define ASM_DECLARE_COLD_FUNCTION_NAME(FILE, NAME, DECL) \
308 do \
309 { \
310 i386_pe_declare_function_type (FILE, NAME, 0); \
311 i386_pe_seh_cold_init (FILE, NAME); \
312 ASM_OUTPUT_LABEL (FILE, NAME); \
313 } \
314 while (0)
315
316 #undef ASM_DECLARE_FUNCTION_SIZE
317 #define ASM_DECLARE_FUNCTION_SIZE(FILE,NAME,DECL) \
318 i386_pe_end_function (FILE, NAME, DECL)
319
320 #undef ASM_DECLARE_COLD_FUNCTION_SIZE
321 #define ASM_DECLARE_COLD_FUNCTION_SIZE(FILE,NAME,DECL) \
322 i386_pe_end_cold_function (FILE, NAME, DECL)
323
324 /* Add an external function to the list of functions to be declared at
325 the end of the file. */
326 #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \
327 do \
328 { \
329 if (TREE_CODE (DECL) == FUNCTION_DECL) \
330 i386_pe_record_external_function ((DECL), (NAME)); \
331 } \
332 while (0)
333
334 /* Declare the type properly for any external libcall. */
335 #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
336 i386_pe_declare_function_type (FILE, XSTR (FUN, 0), 1)
337
338 /* This says out to put a global symbol in the BSS section. */
339 #undef ASM_OUTPUT_ALIGNED_BSS
340 #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \
341 asm_output_aligned_bss ((FILE), (DECL), (NAME), (SIZE), (ALIGN))
342
343 /* Output function declarations at the end of the file. */
344 #undef TARGET_ASM_FILE_END
345 #define TARGET_ASM_FILE_END i386_pe_file_end
346
347 /* Kludge because of missing PE-COFF support for early LTO debug. */
348 #undef TARGET_ASM_LTO_START
349 #define TARGET_ASM_LTO_START i386_pe_asm_lto_start
350 #undef TARGET_ASM_LTO_END
351 #define TARGET_ASM_LTO_END i386_pe_asm_lto_end
352
353 #undef ASM_COMMENT_START
354 #define ASM_COMMENT_START " #"
355
356 #ifndef DWARF2_UNWIND_INFO
357 /* If configured with --disable-sjlj-exceptions, use DWARF2 for 32-bit
358 mode else default to SJLJ. 64-bit code uses SEH unless you request
359 SJLJ. */
360 #if (defined (CONFIG_SJLJ_EXCEPTIONS) && !CONFIG_SJLJ_EXCEPTIONS)
361 /* The logic of this #if must be kept synchronised with the logic
362 for selecting the tmake_eh_file fragment in libgcc/config.host. */
363 #define DWARF2_UNWIND_INFO 1
364 #else
365 #define DWARF2_UNWIND_INFO 0
366 #endif
367 #endif
368
369 #undef PROFILE_HOOK
370 #define PROFILE_HOOK(LABEL) \
371 if (MAIN_NAME_P (DECL_NAME (current_function_decl))) \
372 { \
373 emit_call_insn (gen_rtx_CALL (VOIDmode, \
374 gen_rtx_MEM (FUNCTION_MODE, \
375 gen_rtx_SYMBOL_REF (Pmode, "_monstartup")), \
376 const0_rtx)); \
377 }
378
379 /* For Win32 ABI compatibility */
380 #undef DEFAULT_PCC_STRUCT_RETURN
381 #define DEFAULT_PCC_STRUCT_RETURN 0
382
383 /* MSVC returns aggregate types of up to 8 bytes via registers.
384 See i386.cc:ix86_return_in_memory. */
385 #undef MS_AGGREGATE_RETURN
386 #define MS_AGGREGATE_RETURN 1
387
388 /* Biggest alignment supported by the object file format of this
389 machine. Use this macro to limit the alignment which can be
390 specified using the `__attribute__ ((aligned (N)))' construct. If
391 not defined, the default value is `BIGGEST_ALIGNMENT'. */
392 /* IMAGE_SCN_ALIGN_8192BYTES is the largest section alignment flag
393 specified in the PECOFF60 spec. Native MS compiler also limits
394 user-specified alignment to 8192 bytes. */
395 #undef MAX_OFILE_ALIGNMENT
396 #define MAX_OFILE_ALIGNMENT (8192 * 8)
397
398 /* BIGGEST_FIELD_ALIGNMENT macro is used directly by libobjc, There, we
399 align internal doubles in structures on dword boundaries. Otherwise,
400 support vector modes using ADJUST_FIELD_ALIGN, defined in i386.h. */
401 #ifdef IN_TARGET_LIBS
402 #undef BIGGEST_FIELD_ALIGNMENT
403 #define BIGGEST_FIELD_ALIGNMENT 64
404 #endif
405
406 /* Enable alias attribute support. */
407 #ifndef SET_ASM_OP
408 #define SET_ASM_OP "\t.set\t"
409 #endif
410
411 /* This implements the `alias' attribute, keeping any stdcall or
412 fastcall decoration. */
413 #undef ASM_OUTPUT_DEF_FROM_DECLS
414 #define ASM_OUTPUT_DEF_FROM_DECLS(STREAM, DECL, TARGET) \
415 do \
416 { \
417 const char *alias \
418 = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL)); \
419 i386_pe_maybe_record_exported_symbol (DECL, alias, 0); \
420 if (TREE_CODE (DECL) == FUNCTION_DECL) \
421 i386_pe_declare_function_type (STREAM, alias, \
422 TREE_PUBLIC (DECL)); \
423 ASM_OUTPUT_DEF (STREAM, alias, IDENTIFIER_POINTER (TARGET)); \
424 } while (0)
425
426 /* GNU as supports weak symbols on PECOFF. */
427 #ifdef HAVE_GAS_WEAK
428 #define ASM_WEAKEN_LABEL(FILE, NAME) \
429 do \
430 { \
431 fputs ("\t.weak\t", (FILE)); \
432 assemble_name ((FILE), (NAME)); \
433 fputc ('\n', (FILE)); \
434 } \
435 while (0)
436
437 #endif /* HAVE_GAS_WEAK */
438
439 /* Decide whether it is safe to use a local alias for a virtual function
440 when constructing thunks. */
441 #undef TARGET_USE_LOCAL_THUNK_ALIAS_P
442 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) (!DECL_ONE_ONLY (DECL))
443
444 #define SUBTARGET_ATTRIBUTE_TABLE \
445 { "selectany", 0, 0, true, false, false, false, \
446 ix86_handle_selectany_attribute, NULL }
447 /* { name, min_len, max_len, decl_req, type_req, fn_type_req,
448 affects_type_identity, handler, exclude } */
449
450 /* mcount() does not need a counter variable. */
451 #undef NO_PROFILE_COUNTERS
452 #define NO_PROFILE_COUNTERS 1
453
454 #define TARGET_VALID_DLLIMPORT_ATTRIBUTE_P i386_pe_valid_dllimport_attribute_p
455 #define TARGET_CXX_ADJUST_CLASS_AT_DEFINITION i386_pe_adjust_class_at_definition
456 #define SUBTARGET_MANGLE_DECL_ASSEMBLER_NAME i386_pe_mangle_decl_assembler_name
457
458 #undef TARGET_ASM_ASSEMBLE_VISIBILITY
459 #define TARGET_ASM_ASSEMBLE_VISIBILITY i386_pe_assemble_visibility
460
461 #undef SUB_TARGET_RECORD_STUB
462 #define SUB_TARGET_RECORD_STUB i386_pe_record_stub
463
464 /* Static stack checking is supported by means of probes. */
465 #define STACK_CHECK_STATIC_BUILTIN 1
466
467 #ifndef HAVE_GAS_ALIGNED_COMM
468 # define HAVE_GAS_ALIGNED_COMM 0
469 #endif